1º resultado do google "MP and print size": (em polegadas)
[FONT=arial,helvetica][FONT=arial,helvetica]For a 300 DPI print (super sharp photo intended for viewing up close)[/FONT][FONT=arial,helvetica]Print Size[/FONT] [FONT=arial,helvetica]Resolution needed for 300 DPI print[/FONT]
[FONT=arial,helvetica]4x6[/FONT] [FONT=arial,helvetica]about 2 MP[/FONT]
[FONT=arial,helvetica]5x7[/FONT] [FONT=arial,helvetica]about 3 MP[/FONT]
[FONT=arial,helvetica]8x10[/FONT] [FONT=arial,helvetica]about 6 MP[/FONT]
[FONT=arial,helvetica]11x14[/FONT] [FONT=arial,helvetica]about 14 MP[/FONT]
[FONT=arial,helvetica]13x20[/FONT] [FONT=arial,helvetica]about 23 MP[/FONT] [/FONT]
[FONT=arial,helvetica] [FONT=arial,helvetica]For a 150 DPI print (photo quality when viewed at "arms length")[/FONT][FONT=arial,helvetica]Print Size[/FONT] [FONT=arial,helvetica]Resolution needed for 150 DPI print[/FONT]
[FONT=arial,helvetica]4x6[/FONT] [FONT=arial,helvetica]about 0.5 MP[/FONT] [FONT=arial,helvetica]5x7[/FONT] [FONT=arial,helvetica]about 1 MP[/FONT]
[FONT=arial,helvetica]8x10[/FONT] [FONT=arial,helvetica]about 2 MP[/FONT]
[FONT=arial,helvetica]11x14[/FONT] [FONT=arial,helvetica]about 3.4 MP[/FONT]
[FONT=arial,helvetica]13x20[/FONT] [FONT=arial,helvetica]about 6 MP[/FONT][/FONT]